WTF

wtf

Generally stands for 'What the fu...

Generally stands for 'What the fuck'. Most people use a question mark afterwards to get the point through. Rather than using the same term for the other 'w's, who, when, where, and why, it makes more sense to actually state the word and follow it with 'tf'
Capitalization doesn't really matter.
This term can also be likened to 'What the shit?' which is more comical and has a tantamount meaning.

Wtf

WTF (Windows Text File) is a plain-text file format developed by Microsoft. It is intended for storing text information in readable form. Many users report problems opening it, because most systems don't know what to do with the .wtf file extension. The resulting error messsage 'WTF? Unknown file extension!' is widely known. The chat acronym WTF is commonly used to signify uncertainty or unpleasant surprise.
As part of Microsoft's effort to develop free, open, user-friendly software environments, it is constantly improving file formats. After WMV (Windows Media Video) and (WMA - Windows Media Audio), it published proposals for WMP (Windows Media Picture) and WTF (Windows Text File) in May, 2006.
'WTF?' is the usual response by many users, who are not sure how Microsoft intends to compete with TXT format. Microsoft's release timeline calls for the TXT format to be made obsolete within months, by disallowing Windows Vista to open .txt files.

Felicia builds meter normally during the Kitty Helper hyper (she doesn't get meter when Alto hits though wtf) so while the setup cost seems high, the fact that Felicia can build ~2 bars after a guard break makes it a very realistic and economical option for resets.source: Redditshow contexthide context

wtf :Dsource: Reddit

This was just under the /r/wtf post with the crab and the saw.source: Reddit